Kurumi lives under one roof with her father and her overprotective brother, Ataka. One day, she reunites with Nagio, her childhood friend. Now a strapping young man, Nagio doesn't hesitate at all to make his advances, much to Kurumi's dismay! He would kiss her out of nowhere and tell her how he has always liked her, totally having her wrapped around his finger. While Kurumi didn't like it at first, she eventually finds herself heads over heels for Nagio! This is a childhood friend romance story starring a black-hearted yet loving boy, filled with sweet and passionate kisses!